Cirrus Logic CLPS711X GPIO controller Required properties: - compatible: Should be "cirrus,ep7209-gpio" - reg: Physical base GPIO controller registers location and length. There should be two registers, first is DATA register, the second is DIRECTION. - gpio-controller: Marks the device node as a gpio controller. - #gpio-cells: Should be two. The first cell is the pin number and the second cell is used to specify the gpio polarity: 0 = active high 1 = active low Note: Each GPIO port should have an alias correctly numbered in "aliases" node. Example: aliases { gpio0 = &porta; }; porta: gpio@80000000 { compatible = "cirrus,ep7312-gpio","cirrus,ep7209-gpio"; reg = <0x80000000 0x1>, <0x80000040 0x1>; gpio-controller; #gpio-cells = <2>; };